<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>CSS字重</title>
  <style>
    .weight {
      font-weight: bold;
      font-weight: bolder;
      font-weight: lighter;
      font-weight: normal;
      font-weight: 100;
    }
  </style>
</head>
<body class="body" id="body">
 <div class="weight">你好 Hello World</div>
</body>
</html>
